@misc{indiciaeee1ee2761af2,
  title = {Ground-water conditions in the vicinity of Gillette, Wyoming, with a section on the quality of ground waters},
  author = {Robert T. Littleton and Herbert A. section by Swenson},
  year = {1950},
  doi = {10.3133/cir76},
  url = {https://pubs.usgs.gov/publication/cir76},
  note = {Source identifier: cir76}
}